Donald Trump described Sen. Charles Schumer as a “clown” Thursday in urging both parties to unite and replace ObamaCare.

The comments came in an early morning tweetstorm, in which the president-elect took aim at those who want to keep President Obama’s signature legislative achievement.

“The Democrats, lead by head clown Chuck Schumer, know how bad ObamaCare is and what a mess they are in,” Trump said on Twitter, spelling “led” incorrectly.

“Instead of working to fix it, they do the typical political thing and BLAME. The fact is ObamaCare was a lie from the beginning. ‘Keep you doctor, keep your plan!’ It is time for Republicans & Democrats to get together and come up with a healthcare plan that really works – much less expensive & FAR BETTER!” he added.

One transition source said Trump was hitting back at the Democratic leader — and not starting a fight. “Schumer is going [on the] war path,” the source explained.

It wasn’t the first time Trump used “Schumer” and “clowns in the same sentence. On Wednesday, Trump tweeted, “Don’t let the Schumer clowns out of this web. Massive increases of ObamaCare will take place this year and Dems are to blame for the mess. It will fall of its own weight – be careful!”

In comments on Capitol Hill on Wednesday, Vice President-elect Mike Pence said the “first order of business is to repeal and replace ObamaCare.”

No replacement plan has been unveiled by either the incoming administration or Republicans on Capitol Hill.

“I’d say to the president-elect that this is serious, serious stuff. People’s health is at stake. And, people’s lives are at stake,” Schumer responded in comments to reporters on Capitol Hill.

The top Democrat in the Senate called on Trump to “roll up his sleeves and show us a replacement plan” to ObamaCare.

“I’d say to the president-elect and the Republicans that this is not a time for calling names. It’s time for them to step up to the plate if they want to repeal and show us what they’d replace it with,” said Schumer.

Trump’s Thursday morning comments come days after The Post reported Trump told Schumer that he likes him better than GOP leaders “because they both wanted him to lose.”

“They are Republicans and Trump knows they didn’t support him,” the source said.